Results of the requested tests (steps 3 and 4): * mutter 50.1-0ubuntu2.2 (downgraded + held, 2026-10-13): the leak is unchanged. Two DPMS-off windows with DP-1 flapping: Shmem 1.7 -> 14.2 GB in 31 min and 1.8 -> 12.9 GB in 29 min (~25 GB/h, same as with 2.4), freed again when the screens wake. Overnight it again ran into OOM: the user session died, then the GDM greeter leaked and was OOM-killed/respawned every ~1h40m.
* gnome-shell 50.1-0ubuntu1.2 + mutter 2.2 (2026-10-15): same leak rate whenever DP-1 flaps. The only clean night was one where I had switched the LG monitor off with its power button: then DP-1 stays "connected", there is no HPD flapping and Shmem stays flat. So this is not a regression in 50.1-0ubuntu2.3/2.4 (the title is wrong on that point). It is triggered purely by the connector hotplug flapping, and it happens in the GDM greeter with no user apps running. Back on mutter 50.1-0ubuntu2.4 / gnome-shell 50.1-0ubuntu1.4 (2026-10-20), the same thing again: DP-1 flapping ~240-260 times/h from 18:00, Shmem 27-29 GB, OOM at 19:45 and 21:14 (user session lost), then the greeter OOM-cycled at 22:54, 00:35, 03:15, 04:55, 06:35 and 08:16. Most of the Shmem is ShmemHugePages. The report from comment #4 (Ubuntu 24.04, mutter 46.2, Intel Raptor Lake i915, flapping Dell DP monitor, greeter leaking ~10 MB per hotplug) looks like the same bug, so it also affects mutter 46. Current workaround: power off the DP monitor by hand instead of letting it go into standby. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2170511 Title: Shmem leak (~25 GB/h) leading to OOM when a DisplayPort monitor repeatedly hotplugs while DPMS is off (regression in 50.1-0ubuntu2.4) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/2170511/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
